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DR90/120 Service Diagnostic Tree
Short Cycles (every couple of minutes)
Troubleshooting (continued)
JUMP “R” AND DEHU”
ON TERMINAL BLOCK
IS 120V PRESENT
ON COMPRESSOR
RELAY OUTPUT?
DO THE FAN AND
COMPRESSOR
CYCLE TOGETHER
OR DOES THE FAN
STAY ON?
IS 120V PRESENT
ON COMPRESSOR
OVERLOAD?
IS 120V PRESENT
ON DEFROST
PROBE?
WAIT FOR SHORT
CYCLING TO REOCCUR
AND RETEST
REPLACE COMPRESSOR
RELAY AND RETEST
PERFORMANCE OF UNIT
REPLACE COMPRESSOR
REPLACE COMPRESSOR
OVERLOAD AND RETEST
PERFORMANCE OF UNIT
REPLACE DEFROST
PROBE AND RETEST
PERFORMANCE OF UNIT
REPLACE ONBOARD
DEHUMIDISTAT
REMOVE BACK PANEL AND
CHECK VOLTAGE ON
COMPRESSOR RELAY
(BLACK WIRES) DURING
COMPRESSOR OFF CYCLE
CHECK VOLTAGE AT
DEFROST PROBE
DURING COMPRESSOR
OFF CYCLE
CHECK VOLTAGE AT
COMPRESSOR
OVERLOAD
M33761
YES
YES
YES
YES
FAN
STAYS
ON
CYCLE
TOGETHER
NO
NO
NO
NO
DOES THE
DEHUMIDIFIER
SHORT CYCLE NOW?
TrueDryDR90/DR120DehumidicationSystem69-2690EFS—04 19